Would a new human-like general artificial intelligence be more similar, in terms of eduction, to a toddler or an adult human?
A human-level AI should be able to learn and behave in the same way that humans learn and behave, otherwise, we shouldn't be calling it a human-level AI. So, either if it starts with more or less knowledge of a baby human, it should be able to learn similarly to a human and acquire more knowledge with experience. 


  What is the apparent level of education of an artificial intelligence that could be called human-like?


To answer you question more directly, the level of education of a human-like AI (even newly created ones) can potentially be variable (i.e. different human-like AIs could potentially have different levels of education), but the human-like AI will necessarily need to be able to increase its level of education and, in general, knowledge (because humans can also do this).

Moreover, note that AGI is not necessarily restricted to human-level AI. So, other AGIs may not follow the same principles of humans.